import java.awt.*;
import java.awt.event.*;

public class NobelAdvice extends java.applet.Applet implements ActionListener
{
    TextField mQuery, mAnswer;
    Button bYes, bNo;
    int myLocation;

    public void init()
    {
        mQuery = new TextField(70);
        mQuery.setText("Would you like to read about a scientist?");
        bYes = new Button("Yes");
        bNo = new Button("No");
        myLocation = 0;
        mAnswer = new TextField(70);
        bYes.addActionListener(this);
        bNo.addActionListener(this);
        add(mQuery);
        add(bYes);
        add(bNo);
        add(mAnswer);
    }

    public void actionPerformed(ActionEvent event)
    {
        Object cause = event.getSource();
        if (myLocation == 0)
        {
            if (cause == bYes)
            {
                 myLocation = 1;
                 mQuery.setText("Would you like to read about Einstein?");
            }
            if (cause == bNo)
            {
                 myLocation = 2;
                 mQuery.setText("Would you prefer a humanitarian?");
            }
        }
        else if (myLocation == 1)
        {
            if (cause == bYes)
            {
                 myLocation = 3;
                 mAnswer.setText("He received the Physics Prize in 1921.");
            }
            if (cause == bNo)
            {
                 myLocation = 4;
                 mAnswer.setText("Try the Medicine Prize in 1962.");
            }
        }
        else if (myLocation == 2)
        {
            if (cause == bYes)
            {
                 myLocation = 5;
                 mAnswer.setText("Look up the Peace Prize in 1991.");
            }
            if (cause == bNo)
            {
                 myLocation = 6;
                 mAnswer.setText("Try the Literature Prize, 1970.");
            }
        }
    }
}